$6k\:+\:8l\:-\:4k\:-\:2k\:+10l$
$6x^2+7x+1$
$x-4+3x-1$
$\int\left(\tan\right)^42dx$
$x2\:+\:2x\:<\:3\:\:$
$\lim_{x\to\infty}\left(\frac{x^6}{e^{2x}}\right)$
$\left(3^4-9^2\right)$
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